Limekiln



Patented Dec. 11, 1888.

R. H. BURNS.

LIMBKILN.

(No Model) OM MQ.

UNTTED STATES PATENT OFFICE.

ROBERT H. BURNS, OF BROOKLYN, NEV YORK.

LIIVIEKILN.

SPECIFICATION forming part of Letters Patent No. 394,151, dated December 11, 1888.

Application tiled DecemberZB, 1887. Serial No.258,800. (No model.)

ing is a specification, reference being had to the accompanying drawings.

The object of such improvements is to provide for a free escape of the released vapor,

moisture, and carbonic acid arising from the treated limestone or shells; also, to provide sufficient overturning movement and travel of the limestone or shells to assist in the release of the vapor, moisture, or carbonic acid from every portion and side of the material treated.

A further object of the improvements is to provide for the successful and total burning of the gases of the coal and lime; also, where shells are treated, to provide for the thorough burning of the gelatine contain ed in the shells.

These objects I attain by the use of a furnace or kiln constructed and operated as hereinafter set forth.

Referring to the drawings, Figure l represents a vertical section of a single kiln; Fig. 2, a vertical section yof a double kiln embodying my improvenlents; and Fig. I;

tions showing method of constructii'ig the angular partition guides or trays controlling the movements of both the material and gases, 1

3 represents l a horizontal section of a kiln shown in Fig. l. j Figs. 4, 5, (5, and 7 represent enlarged seci C designates an uptake or chimney for the discharge of the products of comlmstion.

D D DD3 designate in their numerical order, counting from the top, the several angu-i movement through the kiln. These trays are constructed alike and are numbered to distinguish their relative positions in the kilnchamber. At E the burned lime is Withdrawn.

F designates a furnace to furnish the heat.

G is the ash-pit of the furnace; H, the furnace bridge-walls.

a o designate small holes for the passage of the heat from below to the upper portion of the angular partition-trays, as shown in Figs. 4, 5, and 7.

o a designate small lines or passages constructed within the angular partition guides or trays of the double partitions or within the side walls of the kiln, as specially shown in Figs. l and 2, where single angular partitions are used.

ZJ l) designate. sight-holes through which the condition of local. materials may be seen, or through which abar maybe inserted for loosening the material when jammed, or, again, which may be used to admit additional atmospheric air to the combustion-chambers when necessary.

j' designates a guide for furnace products of combustion, and g g designate the combustion-chambers within the kiln-chamber for the burning ot' the gases.

In Fig. t a sectional view of the angular partition guides or trays is shown. d designates the upper portion, and d the lower portion, of the partition. The upper portion is to hold or slide the shells upon. The lower portion is to shield the upper from the direct attack of the heat, but is perforated with holes a c, to permit of a passage of the heat to the tray. The two portions are separated to form a tine, d, between.

Fig. 5 is aview in section at right angles to that of Fig. 4f. Here the upper portion is flat and the lower portion arched, forming the two tiues o u. The perforations for the passage of heat are also shown at o a.

Fig. f5 shows the partition guide or tray formed of but one portion, and that curved in a downward direction across the kihrchamber, to facilitate the movement of thelimestone or shells while under treatment. In this case lar partition guides or trays upon and along the tiues for connecting the associate combus which, from the feed-hopper and from one to another, the material drops and slides in its tion-chambers are formed within the walls of the kiln or at the junction of the partitions IOO with the walls, as shown in Figs. l, 2, and 4 at a.

Fig.- 7 shows a double partition guide or tray in section, fornied of two reverse arches, d and d. The lower arch is perforated for heating the upper one. Flues a a are formed between the pair of arches and connect with the combustion-chainber above, as shown in Figs. l, 2, and 4, either direct through trayarch or through the kiln-walls. Vithin the angles formed between the partition-guides D and the walls of the kiln comlnistion-chambers g and outlets a are provided, as shown in Figs. l, 2, and 4:.

In the regular operation of the kiln a fire is started in the furnace and the kiln-chamber gradually filled with the limestone or shells to be burned. The portion generally occupied by the shells is outlined in Fig. l by dotted lines. As the furnace-fire develops and the walls and partitions, as also the lime, be-

come heated, carbonicl acid is released, comes in contact with the iiame and gases from the furnace, or with the walls and partitions when at a white heat, and, being ignited, burns and Vescapes through the ues to the uptake or chimney, giving out heat to the shells and partitions in their passage. By the burning of all the gases an offensive feature of the limekiln is done away with, and the kilns may be located without injury to surrounding premises in any portion of a large city where any surplus heat may be made use of. The ilues a a may of course be omitted, and the products of combustion and gases forced to pass through the linie while being treated. Such method would not, however, be as efficient as with the smaller iiues, a a.

The depth or size of chamber A is not limited. It may be made higher and additional angular partition-guides inserted for a longer process of burning. \\'here the fines a a are not used and the partition-trays made double, the lower portion is preferably perconsisting of an upper and a lower portion separated vertically from each other to forni a space or flue between them, in combination with a flue communicating with the combustion-chamber above,whereby a constant moyement and combustion of the gases is kept up within said i'lues and combustion-chamber, substantially as set forth.

3. A partition guide or tray for limekilns, consisting of an upper and a lower portion, either one or both of which is arched toward or approaches the other to form side flues or spaces communicating direct with the combustion-chamber above, substantially as set forth. Y

et. A partition guide or tray for liinekilns, consisting of an upper solid portion and a lower perforated portion, either one or both of which is arched toward or approaches the other to form side flues or spaces, whereby direct communication is effected from one vcombustion-chamber, through the perfora- 

